Is your anti-virus scanning external USB drives?

The problem …

Windows Defender does not scan for external drives by default. I have not done this research for all other anti-virus products. But it is not a good idea to avoid scanning of the external drives. We use USB sticks and hard disks all the time. Viruses can enter easily through these drives.

The solution

Manually go and check if your anti-virus is checking the external USB drives.

For Windows Defender, the procedure is as follows. For other applications you have to figure out which menus to use.